I still don't get it.
Think of it like a DNS-layer firewall. Plenty ways to get circumvent it, but works wonderfully, nonetheless.
> in the case I saw it was sudo
This isn't an all-in-one security product. Just one way to firewall trackers, ads, and whatever else one wants.
It's not a broad use case but it's also really cheap to do and doesn't have a lot of maintenance cost.
People who want to learn and/or want something simple. This version is super simple with the whole application being a ~150 line shell script. This makes it very easy to understand and adapt.
Eg. I have a file-server that runs our DHCP and DNS. I've looked into using Pi-hole's setup on it before and it just wasn't worth the trouble due to mismatches between their setup and mine. OTOH this version is very easy to understand and tweak to my needs (eg. using unbound vs. dnsmasq).
This is a good workaround for that use case.
If you're using a computer on which installing this software is an alternative, you can install a web browser with an ad blocker, which performs much better than DNS based filters.
If you're not using such a computer, Pi-Hole proves DNS filtering and this software doesn't.
What's the use-case between these two that isn't already covered?